mirui 0.2.1

A lightweight, no_std ECS-driven UI framework for embedded, desktop, and WebAssembly
Documentation 
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use super::Fixed;

/// Dimension specification for layout properties.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
pub enum Dimension {
    /// Fixed pixel value
    Px(Fixed),
    /// Percentage of parent size (0-100 stored as Fixed)
    Percent(Fixed),
    /// Determined by layout algorithm
    #[default]
    Auto,
    /// Sized to fit content
    Content,
}

impl Dimension {
    /// Resolve this dimension to a concrete Fixed value given the parent's size.
    /// - Px: returns the value directly
    /// - Percent: parent_size * percent / 100
    /// - Auto/Content: returns None (caller must handle)
    #[inline(always)]
    pub fn resolve(self, parent_size: Fixed) -> Option<Fixed> {
        match self {
            Self::Px(v) => Some(v),
            Self::Percent(pct) => Some(parent_size * pct / Fixed::from_int(100)),
            Self::Auto | Self::Content => None,
        }
    }

    #[inline]
    pub fn resolve_or(self, parent_size: Fixed, default: Fixed) -> Fixed {
        self.resolve(parent_size).unwrap_or(default)
    }

    /// Shorthand: `Dimension::px(100)` == `Dimension::Px(Fixed::from_int(100))`
    #[inline]
    pub const fn px(v: i32) -> Self {
        Self::Px(Fixed::from_int(v))
    }

    /// Shorthand: `Dimension::percent(50)` == `Dimension::Percent(Fixed::from_int(50))`
    #[inline]
    pub const fn percent(v: i32) -> Self {
        Self::Percent(Fixed::from_int(v))
    }
}

impl From<i32> for Dimension {
    #[inline]
    fn from(v: i32) -> Self {
        Self::Px(Fixed::from_int(v))
    }
}

impl From<u16> for Dimension {
    #[inline]
    fn from(v: u16) -> Self {
        Self::Px(v.into())
    }
}

impl From<Fixed> for Dimension {
    #[inline]
    fn from(v: Fixed) -> Self {
        Self::Px(v)
    }
}

impl core::ops::Add for Dimension {
    type Output = Self;
    /// Px + Px = Px, Percent + Percent = Percent, otherwise panics.
    #[inline]
    fn add(self, rhs: Self) -> Self {
        match (self, rhs) {
            (Self::Px(a), Self::Px(b)) => Self::Px(a + b),
            (Self::Percent(a), Self::Percent(b)) => Self::Percent(a + b),
            _ => self,
        }
    }
}

impl core::ops::Sub for Dimension {
    type Output = Self;
    #[inline]
    fn sub(self, rhs: Self) -> Self {
        match (self, rhs) {
            (Self::Px(a), Self::Px(b)) => Self::Px(a - b),
            (Self::Percent(a), Self::Percent(b)) => Self::Percent(a - b),
            _ => self,
        }
    }
}

impl core::ops::Mul<Fixed> for Dimension {
    type Output = Self;
    #[inline]
    fn mul(self, rhs: Fixed) -> Self {
        match self {
            Self::Px(v) => Self::Px(v * rhs),
            Self::Percent(v) => Self::Percent(v * rhs),
            other => other,
        }
    }
}

impl core::ops::Div<Fixed> for Dimension {
    type Output = Self;
    #[inline]
    fn div(self, rhs: Fixed) -> Self {
        match self {
            Self::Px(v) => Self::Px(v / rhs),
            Self::Percent(v) => Self::Percent(v / rhs),
            other => other,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn resolve_px() {
        let d = Dimension::Px(Fixed::from_int(50));
        assert_eq!(d.resolve(Fixed::from_int(200)), Some(Fixed::from_int(50)));
    }

    #[test]
    fn resolve_percent() {
        let d = Dimension::Percent(Fixed::from_int(50));
        let result = d.resolve(Fixed::from_int(200)).unwrap();
        assert_eq!(result.to_int(), 100);
    }

    #[test]
    fn resolve_auto() {
        assert_eq!(Dimension::Auto.resolve(Fixed::from_int(200)), None);
    }

    #[test]
    fn from_i32() {
        let d: Dimension = 100.into();
        assert_eq!(d, Dimension::Px(Fixed::from_int(100)));
    }

    #[test]
    fn add_px() {
        let a = Dimension::Px(Fixed::from_int(10));
        let b = Dimension::Px(Fixed::from_int(20));
        assert_eq!((a + b), Dimension::Px(Fixed::from_int(30)));
    }

    #[test]
    fn mul_fixed() {
        let d = Dimension::Px(Fixed::from_int(10));
        let result = d * Fixed::from_f32(1.5);
        assert_eq!(result, Dimension::Px(Fixed::from_f32(15.0)));
    }
}